The trumpeters and singers performed together in unison to praise and give thanks to the Lord. Accompanied by trumpets, cymbals, and other instruments, they raised their voices and praised the Lord with these words: “He is good! His faithful love endures forever!” At that moment a thick cloud filled the Temple of the Lord.
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Even the house of the Lord - Or, according to another reading from the Septuagint, which removes the superfluousness of these words, The…

It came even to pass ... thanking the Lord. — And the trumpeters and the minstrels were to sound aloud, as one man, with one s…

(See Gill on 2 Chronicles 5:1).

God took possession of the temple; he filled it with a cloud. In this way he signified his acceptance of this temple, to be the same to him as the …
Albert Barnes
AlbertBarnes